Seismic damage model for modular prefabricated composite steel-concrete column to steel beam joints

This study aims to evaluate the post-earthquake damage degree of modular precast steel reinforced concrete column-to-steel beam composite joints (MPCJs). The seismic performance level (SPL) and damage index (DI) of MPCJs were classified and quantified using mathematical statistical methods. Based on the analysis of a two-parameter seismic damage model (SDM) incorporating deformation and cumulative energy dissipation (DCED), an SDM suitable for characterizing the seismic performance evolution of MPCJs was established through numerical regression analysis. Subsequently, the modified SDM was utilized to investigate the influence of various parameters on joint damage. The results demonstrate that the SPL of MPCJs can be categorized into five distinct levels. A two-parameter SDM considering DCED was developed based on the Banon model. The accuracy of the proposed SDM and the rationality of the seismic performance classification criteria were effectively validated by comparing the calculated results of the SDM with experimental data and finite element analysis. The proposed DI model provides a reliable representation of the seismic damage behavior of MPCJs.